Pimple for two months....

Hello Dr. Rockoff

About two months ago, I woke up with a small pimple on the shaft (sideway) of my penis. Couple days later, it grew in size (became about 0.5 inches wide). Very ichy and painful to touch. About a week later, it became filled with pus and when you look at it, it look like it has an "red eye" in the middle. Finally, it exploded while I was taking a shower and all the pus came out.
Two months later, it is still there but very small and more looking like a scar. It appears like a bump when the penis is not erected and when erected, it became hard to see although still there.

I am 22 and I have not had sex before of any kind. What this could be ? Will a Bacitracin Ointment helps to remove it ? Thanks.